Create custom PDF documents from templates with Gemini & Google Drive

This workflow contains community nodes that are only compatible with the self-hosted version of n8n.

1 — What Does It Do / Which Problem Does It Solve?

This workflow turns Google Docs-based contract & form templates into ready-to-sign PDFs in minutes—all from a single chat flow.

- Automates repetitive document creation. Instead of copying a rental, sales, or NDA template and filling it by hand every time, the bot asks for the required values and fills them in. - Eliminates human error. It lists every mandatory field so nothing is missed, and removes unnecessary clauses via conditional blocks. - Speeds up approvals. The final draft arrives as a direct PDF link—one click to send for signing. - One template → unlimited variations. Every new template you drop in Drive is auto-listed with zero workflow edits—it scales effortlessly. - 100 % no-code. Runs on n8n + Google Apps Script—no extra backend, self-hosted or cloud.

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2 — How It Works (Detailed Flow)

1. 📝 Template Discovery 📂 The TemplateList node scans the Drive folder you specify via the ?mode=meta endpoint and returns an id / title / desc list. The bot shows this list in chat. 2. 🎯 Selection & Metadata Fetch The user types a template name. 🔍 GetMetaData opens the chosen Doc, extracts METAJSON, placeholders, and conditional blocks, then lists mandatory & optional fields. 3. 🗣 Data-Collection Loop - The bot asks for every placeholder value. - For each conditional block it asks 🟢 Yes / 🔴 No. Answers are accumulated in a data JSON object. 4. ✅ Final Confirmation The bot summarizes the inputs → when the user clicks Confirm, the DocProcess sub-workflow starts. 5. ⚙️ DocProcess Sub-Workflow | 🔧 Step | Node | Task | | --- | --- | --- | | 1 | User Choice Match Check | Verifies name–ID match; throws if wrong | | 2 | GetMetaData (renew) | Gets the latest placeholder list | | 3 | Validate JSON Format | Checks for missing / unknown fields | | 4 | CopyTemplate | Copies the Doc via Drive API | | 5 | FillDocument | Apps Script fills placeholders & removes blocks | | 6 | Generate PDF Link | Builds an export?format=pdf URL | 6. 📎 Delivery The master agent sends 🔗 Download PDF & ✏️ Open Google Doc links. 7. 🚫 Error Paths - status:"ERROR", missing:[…] → bot lists missing fields and re-asks. - unknown:[…] → template list is outdated; rerun TemplateList. - Any Apps Script error → the returned message is shown verbatim in chat.

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